. >>> reporter: megan and her little sister mahdi were christmas shopping with their parents at walmart when mattie spotted a toy sewing machine she always wanted. >> they got it tore me! and she had the bag in her hand. what are you talking about? >> reporter: the girls' parents were randomly handed a bag by a man and woman. and inside -- >> we both looked in the bag and we just said, wow. how did they know that she wanted that toy? >> it's the sewing machine that she wanted. >> reporter: the couple didn't give their names, but employees spotted them hugging one another after their generous deeds. joyce short was working the cash register that day. seem never forget. >> he handed me the money, goes merry christmas to her. and she started crying immediately. and then i started crying. >> reporter: mattie's dad recalls another charming characteristic. >> their job of giving to her just never forget their laugh of joy. >> reporter: the couple spent thousands of dollars that day on merchandise. >> not wanting to be known or seen. they specifically made the comment there's no cameras. we ar